A boy gets down from his motor bike in the wilderness of South America. His name is Ishigami Ryosuke. He has been chasing "Rice Ball", an evil force that throws all life on earth into darkness, and now his journey to take revenge for his mother's murder is coming to an end. A confrontation with Baggy, a lovable new creature, is just around the corner.It was a year ago that Ryosuke first met Baggy. Ryosuke rides on a motorcycle when he feels lonely, as his parents are too busy to spend time with him. One day, he meets a woman as agile and cunningly brutal as a jaguar. She is actually Baggy, the cute kitten that Ryosuke loved and nursed when he was a little boy, and now appears before him in human form. Ryosuke and Baggy then set out on a journey together to solve "the mystery of life".